THE NERVOUS SYSTEM 



261 



TOPICAL OUTLINE 



Pia mater 



Coverings J Arachnoid 



Dura mater 



Cerebrum 



Structure 



Functions 



NERVOUS 

 SYSTEM . 



NERVE SUB- 

 STANCE . . . 



NERVE 

 FIBRES . . . 



NERVES 



Cerebellum 



Medulla . 



Cerebrum 



Cerebellum 



Medulla 



Cerebro- 

 spinal . 



Sympathetic 



f Cellular . . , 

 ' Fibrous . . 



Fresh 

 After death 



f Afferent . . 



< Efferent . . 

 [Mixed. . . 



f Inner, delicate, vascular. 

 -I Closely invests the brain. 

 [ Follows all the convolutions. 



A serous membrane. 

 f Tough, fibrous. 

 J Outer surface rough, and in contact with the 



skull. 



I Inner surface smooth. 

 f Right and left hemispheres. 

 J Surface convoluted. 

 1 Fills all upper portion of cranium. 

 I Gray matter outside. 



Right and left hemispheres. 



Surface drawn into folds. 



Fills occipital portion of cranium. 



Gray matter outside. 

 > Connects the brain with the cord. 

 ' Gray matter inside. 

 ( Chief seat of sensation. 

 -! The organ of the will and voluntary motion. 

 [ The seat of the intelligence. 

 i The seat of muscular sense. 



< Co-ordinates muscular movements. 



(Governs the muscles of respiration and deglu- 

 tition. 

 A conducting medium between the brain and 

 the cord. 



. | Brain and its nerves, 

 f Conslsts Of 1 Spinal cord and its nerves. 

 i Organs of sense. 

 L Fibres distributed to , Voluntary muscles . 



Double chain of ganglia, on 

 each side of the vertebral 

 column. 



Various disconnected ganglia. 

 f The internal organs. 



Fibres distributed to -j The walls of blood- 

 [ vessels. 



Grayish in nerve centres. 

 ( Nerve fibres forms nerves, and enters into 



< the structure of nerve centres. 



A simple semitransparent filament. 

 j A tube, containing a white opaque sub- 

 * stance. 



( Convey impressions to a centre only. 

 "l Also called sensory nerves, 

 f Convey impressions from a centre only. 

 ; Fibres terminate in muscular fibres 

 t Also called motor nerves. 



Contain both afferent and efferent fibres. 



Consists of 



